Work-clamp



.l. G. SAUER.

WORK CLAMP.

APPLICATION FILED NOV.4, 1919.

1,37Q,833 Patented Mar. 2% 19211.

J? ATTORNEYS .roi-rN eno. sauna, or winrlrniusronr, PENNSYLVANIA.

WORK-CLAMP.

arness.

Specificationof Letters Patent.

Patented Mar. 29, 1921.

To all whom it may concern:

Be it known that T, JOHN G. SAUNR, a citizen of the United States, and resident of l/Villiamsport, in the county of Lycoming and State of iennsylvania, have invented certain new and useful Improvements 111 Work-Clamps, of which the following 1s a specification.

The present invention relates to work clamps and more particularly to the type 111 which two jaws are provided movable relatively to each other in parallehlines, the action being controlled by ad ustmg means which holds the jaws in their relatively adjusted positions, an object of this invent on being to provide an adjusting means which will have a maximum power while permitting a maximum adjustment between the jaws, the clamp being free of obstructlng parts so that it may be readlly used upon a machine tool table.

To this and other ends, the inventlon consists of certain parts and combinations of parts, all of which will be heremafter described, the novel features belng polnted out in the appended claims.

In the drawings:

Figure 1 is a side view of a clamp constructed-in accordance with this invention, the clamp being shown with the jaws close together;

Fig. 2 is a side view showing the aws partially open and the tool ad usted for larger work; 7

Fig. 3 is anend view of the tool in the position of adjustment shown in Fig.

Fig. 1 is a section on the line 4-.4, F g. 2;

Fig. 5 is a section on the line 55, Fig. 2;

Fig. 6 is a detail view of one of the nuts showing its connection with one of the toglesg Fig. 7 is a detail section on the line 7-7, Fig-1;

Fig. 8 1s a section on the line 8-8, Flg.

Fig. 9 is a detail view of another embod1 ment of the invention; and

Fig. 10 is an enlarged section of the embodiment shown in Fig. 9.

Referring more particularly to the drawings, 1 and 2 indicate the jaws whlch are n this instance in the form of bars arranged in parallel relation. One of these jaws is sup ported preferably by a thrust bar 3, the support being preferably effected through two PZLlPS'Of adjustable connections which maintain the thrust bar in parallel relation to the aws.

Each adjustable connection, in this instance, embodies a sleeve 1 having right and left hand threads therein engaging two threaded rods 5 which lit in opposite ends of the sleeve and are oppositely threaded. One of these rods is secured to the thrust bar 3 while the other rod is secured to the jaw 1. The rods 5 are secured in pairs to the jaw 1 and the thrust bar 3 and to this end the jaw and the thrust bar are provided at opposite sides with recesses 6 in which extensions 7 on the rods 5 are received. A single screw 8 passes through two of the rods 5 and the part to which said rods is secured in order to hold the rods to such part. It is apparent that the turning of. the sleeve 4 in one direction will move the thrust bar 3 away from the aw 1 while the turning of the sleeve 4 in the other direction will move the thrust bar toward the jaw l.

The movable jaw 2 is supported from the thrust bar 3 by an adjusting mechanism which preferably embodies two toggles supporting the movable aw 2 for parallel movement toward and from the jaw 1. In this instance, each toggle is formed of four links 9, two of which are pivotally connected to the movable jaw 2 by a pivot pin 10 while the other two of which are pivotally connected to the thrust bar 3 by a pivot pin 11. A. pivot member 12 pivotally connects one of said pair of links with the other of said pair of links and, in this instance, is reduced at opposite sides to provide a shoulder .13 and a bearing 14, one of the links of each pair fitting on the bearing and the two being held thereon by a nut 15.

To the end that the movable jaw may be moved in close proximity to the thrust bar 3, the opposed faces of the thrust bar 3 and the movable jaw 2 are provided with notches or recesses 16 in which the pivot pieces 12 may be received. Movement f the toggles is preferably effected by a smgle screw 17 whose axis lies parallel with the length of the jaws and between the thrust bar and the movable jaw 2, the screw being'connected to the pivot pieces 12 in such a manner that V the turning of the screw will either expand the toggles or fold the same, the knuckles of the toggles moving toward each other. Opposed faces of the thrust bar and the movable jaw are longitudinally grooved at 21 to provide a space in which the screw may be received when the movable jaw is close to the thrust bar.

In the embodiment shown in Figs. 1 to 8, the screw 17 has right and left screw threaded portions thereon, one of which turns in the pivot piece 12 of one toggle while the other turns in the pivot piece 12 of the other toggle, such pivot pieces thereby acting as nuts.

In the embodiment shown in Figs. 9 and 10 the screw 17 has but one thread and it is provided with a bearing 20 in one of the pivot pieces 12 while the other pivot piece acts as a nut.

From the foregoing it will be seen that there has been provided a clamp in which the jaws are adapted to move parallel with each other under the action of an adjusting means which is capable of exerting a maximum amount of power. This adjusting means is in the form of a plurality of toggles pivotally connecting the movable jaw of the clamp with the thrust bar which is rigidly connected to the other jaw. The toggles are operated by a screw which lies with its axis parallel with the clamping faces of the jaws. The clamping screw engages in pivot pieces arranged at the knuckles of the toggles. The thrust bar is adjustably connected with the rigid jaw of the clamp so as to permit the distance between the movable jaw and the rigid jaw to be varied. This adjusting means is of simple construction and is strong and durable.

What I claim as my invention and desire to secure by Letters Patent is:

1. A work clamp comprising a pair of jaws of equal length, a thrust bar of less length than the jaws secured to one of said jaws, and two toggles connecting the other jaw and the thrust bar, said toggles being connected to the bar and the jaw at two spaced points and when folded having their knuckles disposed toward each other, causing the separation of the jaws, and means for simultaneously moving said jaws in opposite directions.

2. A work clamp comprising a pair of jaws, a thrust bar secured to one of the'jaws and also being of less length than the jaws so that the jaws project beyond one end of the thrust bar, the opposed faces of one of the jaws and the thrust bar being provided with longitudinally extending grooves, and two toggles connecting the said jaw and thrust bar, said toggles being connected to the bar and the jaw at two spaced points and when folded having their knuckles disposed toward each other, causing the separation of the jaws, and a single screw connected with the toggles and adapted to be received within the grooves in the opposed faces of the jaw and the thrust bar.

3. A work clamp comprising a pair of jaws, a thrust bar secured to one of the jaws and also being of less length than the jaws so that the jaws project beyond one end of the thrust bar, the opposed faces of the other jaw and the thrust bar being provided with recesses, and two toggles-connecting the last mentioned jaw and the thrust bar, said toggles being connected to the jaw and the bar at two spaced points and when folded having their knuckles disposed toward each other, causing the separation of the jaws, the knuckles of the toggles when in folded position being received within the recesses in the opposed faces of the jaw and the thrust bar. 3 v r 4. A. work clamp comprising a pair of jaws, a thrust bar secured to one of said jaws and also being of less length than the jaws so that the jaws project beyond one end of the thrust bar. the opposed faces of the other j awv and the thrust bar being provided with longitudinal grooves and recesses, toggles connecting the other of said jaws with the thrust bar and each formed of four links, two of which are pivoted to the thrust bar on a common axis and the other two of which are pivoted to the movable jaw on a common axis, pivot pieces being provided for connecting the first mentioned links to the second mentioned links, the toggles being connected to the bar and the jaw at two spaced points and when folded having their knuckles disposed toward each other, causing the separation of the jaws, the knuckles being adapted to be received in the recesses in the opposed faces of the thrust bar and the jaw, and a single screw connecting the pivot pieces and adapted to be received in the grooves in the opposed faces of the said jaw and thrust bar.

5. A work clamp comprising a thrust bar, a jaw adjustably connected with said thrust bar, a movable jaw operating between the first mentioned jaw and the thrust bar, the jaws projecting beyond one end of the thrust bar, and means for moving said movable jaw connected with said thrust bar.

6. A work clamp comprising a thrust bar,

a jaw, screw rods connected to the thrust bar, screw rods connected to said jaw, sleeves connecting said rods and having right and left hand threads through which the. jaw

may be moved with relation tothe thrust 7. A work clamp comprising a thrust bar, through which the jaw may be moved with a jaw, two pairs of screw rods secured to opreference to the thrust bar, a movable jaw posite sides of the thrust bar, two pairs of operating between the first named jaw and 0 screw rods secured to opposite sides of the the thrust bar, and means for eifecting the 5 jaw, sleeves connecting the screw rods of movement of the movable jaw.

the thrust bar with the screw rods of the jaw and having right and left hand threads JOHN GEO. SAUER. 

